JP2870182B2 - rice cooker - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a rice cooker having a deodorizing function.

(Prior art) Generally, a rice cooker heats rice and water, which are contained in a container, by using a rice cooker and cooks the cooked rice using a warming heater to keep the rice at a predetermined temperature. It is configured to be.

By the way, it is known that when the rice is kept warm, fatty acids such as linoleic acid and oleic acid of the rice are oxidized to produce a bad smell, and the bad smell reduces the taste of the kept warm rice. A rice cooker provided with the same has been proposed. This type of rice cooker is equipped with a deoxygenator,
Alternatively, there is a device equipped with a deodorizing device using activated carbon or an ozone deodorizing device.

(Problems to be Solved by the Invention) In the above prior art, those provided with a deoxidizer and an ozone deodorizer have a complicated structure and cost increase, and those provided with a deodorizer using activated carbon require the same. There is a problem that it is not easy to use because it needs to be replaced periodically.

Therefore, an object of the present invention is to provide a rice cooker which has a simple structure and can save the trouble of periodically replacing the deodorizing device.

[Structure of the Invention] (Means for Solving the Problems) A rice cooker according to the present invention is provided with a container body for accommodating a container, a lid for opening and closing an upper opening of the container body, and provided inside the lid. It has a heating means and a deodorizing device provided on a well-meaning lid and heated by the heating means. The deodorizing device is constituted by a silica-based adsorbent whose surface is coated with a platinum catalyst.

(Operation) According to the above configuration, the malodorous component generated from the rice during the heat retention is adsorbed and deodorized by the silica-based adsorption system of the deodorization device provided on the lid. On the other hand, the malodorous component adsorbed by the silica-based adsorbent is released and heated and regenerated by heating the deodorizing device by the heating means provided in the lid during rice cooking. The released malodorous component is oxidized by the platinum catalyst to eliminate the malodor.

Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

As shown in FIG. 1, an outer case 2 joined by an upper frame 1 and an inner case 4 provided inside the outer case 2 with a heat insulating material 3 therebetween constitute a container main body 5. The outer surface 4 is provided with a heat retaining body heater 6 composed of a cord heater or the like. A container 7 made of aluminum or the like is housed in the container body 5 so as to be freely inserted and removed.
A step 8 is formed around the upper part of the upper frame 1 so as to be in close contact with the upper frame 1. The container body 5 is provided with a lid 9 for opening and closing the upper opening. The lid 9 is composed of an outer lid 10 and an inner lid.
It is composed of 11 and a radiator plate 12 provided below the inner lid 11. A packing 14 that is in contact with the upper edge 13 of the container 7 is adhered to the outer peripheral edge of the heat sink 12. Heat sink 12
On the top surface, a rice cooking lid heater 15 as a heating means composed of a code heater or the like is provided at the center and outside, and a warming lid heater 16 composed of a code heater or the like is provided between the center and the outside. ing. Further, a deodorizing device 17 is provided in the center of the lower surface of the heat sink 12. This deodorizer 17
Is made of a silica-based adsorbent such as silica gel similar to activated carbon, and its surface is coated with a platinum catalyst. A rice-cooking heater 18 composed of a sheathed heater or the like is provided at an inner bottom portion of the inner case, and a cup-shaped heat-sensitive portion 19 is provided so as to elastically press against the outer bottom portion of the container 7. Temperature sensor such as thermistor inside
20 are provided.

FIG. 2 shows an operation panel provided on the main body 5 or the lid 9, which has a display section 21 and an operation section 22. The display section 21 has a current time display section 23 made up of an LCD. A cooked time display section 24 and a meal remaining time display section 25 are provided. The display unit 21 has a mode display unit 26 composed of LEDs,
27 and 28, 26 is for a timer, 27 is for cooking rice, and 28 is for keeping warm, and displays the mode being processed.
The operation unit 22 has a time switch 29 for adjusting the current time.
And a back switch 30, a forward switch 31 for adjusting the current time or the cooked time, a timer rice cooker switch 32 for setting a reserved rice cooker, and a rice cooker switch 33 for executing normal rice cooked or reserved rice cooker, Off switch
And 34.

FIG. 3 is a block diagram showing an electric configuration, which is provided with a microcomputer 35, which includes a CPU 36, a clock circuit 37, a memory 38, an input circuit 39, an output circuit 40, etc., as is well known. Have. Further, the microcomputer 35 has a plurality of rice cooking programs,
The switch signal from the operation unit 22 and the A /
Based on the temperature detection signal input via the D converter 41, the heaters 6, 15, 16, and 18 are drive-controlled via the drive circuits 42 and 43, and the drive of the display unit 21 is controlled via the drive circuit 44.

FIG. 4 shows a circuit diagram of the power supply section and the heater drive section, which is connected between both terminals of the commercial power supply 45.
And a parallel circuit of the rice heating lid heater 15, a parallel circuit of the heat retaining body heater 6 and the heat retaining lid heater 16, and a triac 46 are connected in series. Heating body heater 6, Heating lid heater 16
A relay 47 is used for the parallel circuit of
Are connected in parallel. Further, a predetermined power supply voltage is supplied to the microcomputer 35 via the power supply transformer 48 and the constant voltage circuit 49. Further, the microcomputer 35 outputs a signal from a container detection switch 50 for detecting that the container 7 is set in the inner case 4. Further, the microcomputer 35 excites the excitation coil 47B of the relay via the drive circuit 42, drives the triac 46 via the drive circuit 43, opens the triac 46 during rice cooking and closes the relay 47 to cook the rice cooking heater. 18 and rice lid heater 15
And a parallel circuit of the rice cook heater 18, the rice cook lid heater 15 and the parallel circuit of the heat retainer lid heater 16 and the heat retainer body heater 6 connected in series via the triac 46 during the heat retention. It has become.

Next, the operation of the above configuration will be described with reference to FIG. In FIG. 5, A shows a container temperature characteristic line, and B shows a rice temperature characteristic line.

The user presses the timer rice cooker switch 32 to set a rice cooker reservation, forward switch 31 and return switch 3
Set the cook time by operating 0 and set the rice cooker switch 33
When the microcomputer 35 is pressed, the microcomputer 35 starts the timekeeping operation by the timekeeping circuit 37, and when the required rice cooking time, for example, one hour is subtracted from the cooked time in consideration of the maximum amount of cooked rice, when the rice cooking start time is reached, the triac 46 is opened and the relay switch 47A is opened.
Is closed, and a series circuit of the rice cooker 18 and the rice cooker heater 15 is energized to start cooking rice. On the other hand, if the user presses the rice cooker switch 33 without setting the rice cooker reservation, the rice cooker
Electricity is supplied to the row circuit 18 and the rice cooking lid heater 15 to start cooking rice. When the rice cooking process is performed in this manner, the microcomputer 35 sets the temperature detected by the temperature sensor 20 to 12
When the temperature reaches 0 ° C. or higher, it is detected as a cooking state, the heaters 18 and 15 are cut off, and the process shifts to an uneven process. In this swinging process, a heater is used to maintain the inside of the container 7 in a boiling state.
In the case of reserved rice cooking, the swing process is executed until a predetermined cooking time, and when the rice is not reserved rice cooking, the boiling process for a predetermined boiling duration, for example, 20 minutes is executed. When the steaming process is over, the rice is cooked and the meal is kept warm. In this case, when the boiling state occurs during the rice cooking operation consisting of the rice cooking process and the rice cooking process, the temperature of the container 7 becomes approximately 100 ° C. due to the generation of steam, and the heat of the rice cooking lid heater 15 is transmitted through the radiator plate 12 to the deodorizing device. The deodorizing device 17 is brought to a high temperature state of about 120 to 150 ° C., thereby releasing the malodorous component adsorbed by the silica-based adsorbent of the deodorizing device 17 and restoring the adsorbing function and releasing the same. The offensive odor component is oxidized by a platinum catalyst coated on the surface of the silica-based adsorbent to eliminate the odor.

In order to keep the food warm, the relay switch 47A is opened, and a series circuit of the parallel circuit of the heat retaining lid heater 16 and the body retaining heater 6 and the parallel circuit of the rice cooker 18 and the rice cooker lid heater 15 is connected via the triac 46. By controlling the power cutoff, the container detection temperature is maintained at around 90 ° C. for about one hour.
After that, it shifts to normal heat retention, and the container detection temperature becomes 70 to 76 ° C.
In order to maintain the degree, the same heater cutoff control as in the case of keeping the temperature around the meal is performed. In this meal warming operation and the normal warming operation, the temperature of the deodorizer 17 is lower than during cooking, and malodorous components generated by oxidation of fatty acids such as linoleic acid and oleic acid in the rice are provided on the lower surface of the heat radiating plate 12. The deodorizing device 17 is adsorbed and deodorized by the silica-based adsorbent, and the malodorous component adsorbed by the silica-based adsorbent is released during the next rice cooking, and the deodorizing device 17 is heated and regenerated. In addition, the reason why the heater control temperature is maintained at around 90 ° C. during the food preservation is that it is higher than the normal heat preservation temperature in order to prevent a drop in the rice temperature, and lower than the boiling temperature in order to prevent scorch. It is a temperature that does not cause any inconvenience even if it is etc., and the temperature after loosening freshly cooked rice will be around 85 ° C due to contact with air, so if it is above this temperature it will be close to the freshly cooked temperature, The reason why the heat retention time was set to about 1 hour was that it was set to a short time in consideration of the fact that if this time was too long, the reaction between sugar and amino acids would cause the yellowing of the rice to increase and the generation of offensive odors to increase. The remaining time of the meal keeping time is displayed on the remaining time display section 25 because the user looks at this display and eats the food while keeping the meal warm, so that he / she can eat deliciously. This kind of preservation during meals is a time when small-sized reserved rice cooks, so that it becomes cooked early, so that the subsequent drying process becomes longer and the rice temperature decreases, and at the same time large-sized reserved cooked rice and normal rice cooked Even in this case, it is to prevent the rice cooked from dropping during the warming after the completion of the cooked rice and the hot feeling is spoiled. As described above, in the present embodiment, the deodorizing device 17 made of a silica-based adsorbent whose surface is coated with a platinum catalyst is provided on the lower surface of the heat radiating plate 12 provided with the rice cooking lid heater 15 in the lid 9, so that the temperature is maintained during the heat retention. The malodorous component generated from the rice is adsorbed by the silica-based adsorbent of the deodorizer 17 and deodorized, and the malodorous component adsorbed by the silica-based adsorbent is malodorized by the platinum catalyst during the rice cooking and released. As a result, the heating and regeneration of the deodorizing device 17 are performed, so that the structure can be simplified and the cost can be reduced as compared with a rice cooker equipped with a deoxidizing device and an ozone deodorizing device, and the deodorizing device is periodically replaced. This saves time and effort and improves usability.

The present invention is not limited to the above embodiment, and various modifications can be made within the scope of the present invention. For example, the same deodorizing and heating / regenerating effects can be obtained even if the deodorizing device is provided in a rice cooker that does not have a meal keeping function or a reserved rice cooking function.

[Effects of the Invention] The present invention provides a container main body for accommodating a container, a lid for opening and closing the top opening of the container main body, a heating means provided inside the lid, and a heating means provided on the lid. A heated deodorizer, which is composed of a silica-based adsorbent whose surface is coated with a platinum catalyst, has a simple structure and can save the trouble of periodically replacing the deodorizer. Vessel can be provided.

[Brief description of the drawings]

1 to 5 show one embodiment of the present invention. FIG. 1 is a longitudinal sectional view of a rice cooker provided with a deodorizing device, FIG. 2 is a front view of an operation panel, and FIG. FIG. 4 is a block diagram showing an electrical configuration, FIG. 4 is a circuit configuration diagram, and FIG. 5 is a graph showing a container temperature characteristic and a rice temperature characteristic in a series of rice cooking and heat keeping control. 5 container body 7 container 9 lid 15 rice cooking lid heater (heating means) 17 deodorizing device

Claims (1)

(57) [Claims] 1. A container body for accommodating a container, a lid for opening and closing an upper opening of the container body, a heating means provided inside the lid, and a heating means provided on the lid and heated by the heating means. A rice cooker having a deodorizer, wherein the deodorizer is composed of a silica-based adsorbent whose surface is coated with a platinum catalyst.